window API一天一练之共享内存.docx

今天学习win下共享内存的进程通信，仿照Qt的共享内存类，封装了一个简单的类。虽然比不上Qt的类那么完善和强大，但是通过学习也达到了理解win共享内存的方式。html view plaincopy1. classWinSharedMemory2. 3. public:4. WinSharedMemory(stringszkey=);5. WinSharedMemory();6. 7. boolCreateSize(intsize);8. void*Data();9. constvoid*ConstData()const;10. boolAttach();11. boolDetach();12. boolIsAttach();13. boolLock();14. boolUnLock();15. intSize();16. voidSetkey(stringszKey);17. stringKey();18. stringGetErrorMessage();19. protected:20. voidcleanHandle();21. private:22. stringm_errorMessage;23. intm_size;24. stringm_memKey;25. boolm_isLock;26. HANDLEm_mutex;27. HANDLEm_fileMapping;28. void*m_pMemory;29. ;html view plaincopy1. WinSharedMemory:WinSharedMemory(stringszkey/*=*/):m_memKey(szkey)2. ,m_isLock(false),m_mutex(NULL),m_pMemory(NULL),m_size(0),m_fileMapping(NULL)3. 4. 5. 6. WinSharedMemory:WinSharedMemory()7. 8. this-Setkey();9. 10. 11. boolWinSharedMemory:CreateSize(intsize)12. 13. if(m_memKey=)14. 15. m_errorMessage=没有设置共享内存名;16. returnfalse;17. 18. if(sizesetText(QString:fromStdString(pText);37. 38. 39. voidSharedMemory:WriteDataToMemorySlot()40. 41. intsize=1024*1024;42. WinSharedMemorysharedMemory;43. sharedMemory.Setkey(FileMapObject);44. if(sharedMemory.IsAttach()45. 46. sharedMemory.Detach();47. 48. sharedMemory.CreateSize(size);49. sharedMemory.Attach();50. sharedMemory.Lock();51. char*pmemory=(char*)sharedMemory.Data();52. stringtext=m_pTextEdit-toPlainText().toStdString();53. strcpy(pmemory,text.c_str();54. sharedMemory.UnLock();55. 56. 57. 58. voidSharedMemory:resizeEvent(QResizeEvent*event)59. 60. this-setFixedSize(QSize(500,300);61. m_pReadDataBtn-setGeometry(0,0,100,20);62. m_pReadDataBtn-setGeometry(12